Documentation
Video Call
Function overview
Function Overview

Function Overview

Last updated：2025-08-27 12:10

ZEGO SDK has network nodes that fully cover key areas of the world, provides rich APIs, and provides clear and stable real-time voice and video cloud services for multiple terminals.

For the error codes returned by the API, please refer to: https://www.zegocloud.com/docs/video-call/error-code.

The following is a brief introduction to the basic API.

main

Method	Description
CreateEngine	Create ZegoExpressEngine singleton object and initialize SDK.
DestroyEngine	Destroy the ZegoExpressEngine singleton object and deinitialize the SDK.
GetEngine	Returns the singleton instance of ZegoExpressEngine.
SetEngineConfig	Set advanced engine configuration.
SetLogConfig	Set log configuration.
SetRoomMode	Set room mode.
GetVersion	Gets the SDK's version number.
UploadLog	Uploads logs to the ZEGO server.
SubmitLog	Uploads logs to the ZEGO server.
EnableDebugAssistant	Enable the debug assistant. Note, do not enable this feature in the online version! Use only during development phase!
OnDebugError	The callback for obtaining debugging error information.
OnEngineStateUpdate	The callback triggered when the audio/video engine state changes.

room

Method	Description
LoginRoom	Logs in to a room with advanced room configurations. You must log in to a room before publishing or playing streams.
LogoutRoom	Exit the room.
LogoutRoom	Exit the room of the specified room ID.
SwitchRoom	Switch the room with advanced room configurations.
SetRoomExtraInfo	Set room extra information.
OnRoomStateUpdate	Notification of the room connection state changes.
OnRoomUserUpdate	The callback triggered when the number of other users in the room increases or decreases.
OnRoomOnlineUserCountUpdate	The callback triggered every 30 seconds to report the current number of online users.
OnRoomStreamUpdate	The callback triggered when the number of streams published by the other users in the same room increases or decreases.
OnRoomStreamExtraInfoUpdate	The callback triggered when there is an update on the extra information of the streams published by other users in the same room.
OnRoomExtraInfoUpdate	The callback triggered when there is an update on the extra information of the room.

publisher

Method	Description
StartPublishingStream	Starts publishing a stream (for the specified channel). You can call this function to publish a second stream.
StartPublishingStream	Starts publishing a stream. Support multi-room mode.
StopPublishingStream	Stops publishing a stream (for the specified channel).
SetStreamExtraInfo	Sets the extra information of the stream being published for the specified publish channel.
StartPreview	Starts/Updates the local video preview (for the specified channel).
StopPreview	Stops the local preview (for the specified channel).
SetVideoConfig	Sets up the video configurations (for the specified channel).
GetVideoConfig	Gets the current video configurations (for the specified channel).
SetVideoMirrorMode	Sets the video mirroring mode (for the specified channel).
SetAppOrientation	Sets the video orientation (for the specified channel).
SetAudioConfig	Sets up the audio configurations for the specified publish channel.
GetAudioConfig	Gets the current audio configurations.
MutePublishStreamAudio	Stops or resumes sending the audio part of a stream for the specified channel.
MutePublishStreamVideo	Stops or resumes sending the video part of a stream for the specified channel.
EnableTrafficControl	Enables or disables traffic control.
SetMinVideoBitrateForTrafficControl	Set the minimum video bitrate threshold for traffic control.
SetCaptureVolume	Sets the audio recording volume for stream publishing.
SetAudioCaptureStereoMode	Set audio capture stereo mode.
AddPublishCdnUrl	Adds a target CDN URL to which the stream will be relayed from ZEGO RTC server.
RemovePublishCdnUrl	Deletes the specified CDN URL, which is used for relaying streams from ZEGO RTC server to CDN.
EnablePublishDirectToCDN	Whether to directly push to CDN (without going through the ZEGO RTC server), for the specified channel.
SendSEI	Sends Supplemental Enhancement Information to the specified publish channel.
EnableHardwareEncoder	Enables or disables hardware encoding.
SetCapturePipelineScaleMode	Sets the timing of video scaling in the video capture workflow. You can choose to do video scaling right after video capture (the default value) or before encoding.
OnPublisherStateUpdate	The callback triggered when the state of stream publishing changes.
OnPublisherQualityUpdate	Callback for current stream publishing quality.
OnPublisherCapturedAudioFirstFrame	The callback triggered when the first audio frame is captured.
OnPublisherCapturedVideoFirstFrame	The callback triggered when the first video frame is captured.
OnPublisherVideoSizeChanged	The callback triggered when the video capture resolution changes.
OnPublisherRelayCDNStateUpdate	The callback triggered when the state of relayed streaming to CDN changes.

player

Method	Description
StartPlayingStream	Starts playing a stream from ZEGO RTC server or from third-party CDN. Support multi-room mode.
StopPlayingStream	Stops playing a stream.
SetPlayVolume	Sets the stream playback volume.
MutePlayStreamAudio	Whether the pull stream can receive the specified audio data.
MutePlayStreamVideo	Whether the pull stream can receive the specified video data.
EnableHardwareDecoder	Enables or disables hardware decoding.
EnableCheckPoc	Enables or disables frame order detection.
OnPlayerStateUpdate	The callback triggered when the state of stream playing changes.
OnPlayerQualityUpdate	Callback for current stream playing quality.
OnPlayerMediaEvent	The callback triggered when a media event occurs during streaming playing.
OnPlayerRecvAudioFirstFrame	The callback triggered when the first audio frame is received.
OnPlayerRecvVideoFirstFrame	The callback triggered when the first video frame is received.
OnPlayerRenderVideoFirstFrame	The callback triggered when the first video frame is rendered.
OnPlayerVideoSizeChanged	The callback triggered when the stream playback resolution changes.
OnPlayerRecvSEI	The callback triggered when Supplemental Enhancement Information is received.

IM

Method	Description
SendBroadcastMessage	Sends a Broadcast Message.
SendBarrageMessage	Sends a Barrage Message (bullet screen) to all users in the same room, without guaranteeing the delivery.
SendCustomCommand	Sends a Custom Command to the specified users in the same room.
OnIMRecvBroadcastMessage	The callback triggered when Broadcast Messages are received.
OnIMRecvBarrageMessage	The callback triggered when Barrage Messages are received.
OnIMRecvCustomCommand	The callback triggered when a Custom Command is received.

mixer

Method	Description
StartMixerTask	Starts a stream mixing task.
StopMixerTask	Stops a stream mixing task.
OnMixerRelayCDNStateUpdate	The callback triggered when the state of relayed streaming of the mixed stream to CDN changes.
OnMixerSoundLevelUpdate	The callback triggered when the sound level of any input stream changes in the stream mixing process.

preprocess

Method	Description
EnableAEC	Whether to enable acoustic echo cancellation (AEC).
SetAECMode	Sets the acoustic echo cancellation (AEC) mode.
EnableAGC	Enables or disables automatic gain control (AGC).
EnableANS	Enables or disables active noise suppression (ANS, aka ANC).
EnableTransientANS	Enables or disables transient noise suppression.
SetANSMode	Sets the automatic noise suppression (ANS) mode.

mediaPlayer

Method	Description
CreateMediaPlayer	Creates a media player instance.
DestroyMediaPlayer	Destroys a media player instance.

record

Method	Description
StartRecordingCapturedData	Starts to record and directly save the data to a file.
StopRecordingCapturedData	Stops recording locally captured audio or video.
OnCapturedDataRecordStateUpdate	The callback triggered when the state of data recording (to a file) changes.
OnCapturedDataRecordProgressUpdate	The callback to report the current recording progress.

device

Method	Description
MuteMicrophone	Mutes or unmutes the microphone.
IsMicrophoneMuted	Checks whether the microphone is muted.
MuteSpeaker	Mutes or unmutes the audio output speaker.
IsSpeakerMuted	Checks whether the audio output speaker is muted.
GetAudioDeviceList	Gets a list of audio devices.
UseAudioDevice	Chooses to use the specified audio device.
EnableAudioCaptureDevice	Enables or disables the audio capture device.
EnableCamera	Turns on/off the camera (for the specified channel).
UseFrontCamera	Switches to the front or the rear camera (for the specified channel).
UseVideoDevice	Chooses to use the specified video device (for the specified channel).
GetVideoDeviceList	Gets a list of video devices.
StartSoundLevelMonitor	Starts sound level monitoring. Support setting the listening interval.
StartSoundLevelMonitor	Starts sound level monitoring. Support enable some advanced feature.
StopSoundLevelMonitor	Stops sound level monitoring.
StartAudioSpectrumMonitor	Starts audio spectrum monitoring. Support setting the listening interval.
StopAudioSpectrumMonitor	Stops audio spectrum monitoring.
EnableHeadphoneMonitor	Enables or disables headphone monitoring.
SetHeadphoneMonitorVolume	Sets the headphone monitor volume.
OnCapturedSoundLevelUpdate	The local captured audio sound level callback.
OnRemoteSoundLevelUpdate	The remote playing streams audio sound level callback.
OnCapturedAudioSpectrumUpdate	The local captured audio spectrum callback.
OnRemoteAudioSpectrumUpdate	The remote playing streams audio spectrum callback.
OnLocalDeviceExceptionOccurred	The callback triggered when a local device exception occurred.
OnRemoteCameraStateUpdate	The callback triggered when the state of the remote camera changes.
OnRemoteMicStateUpdate	The callback triggered when the state of the remote microphone changes.

customVideoIO

Method	Description
EnableCustomVideoRender	Enables or disables custom video rendering.
EnableCustomVideoCapture	Enables or disables custom video capture (for the specified channel).
SendCustomVideoCaptureRawData	Sends the video frames (Raw Data) produced by custom video capture to the SDK (for the specified channel).
SendCustomVideoCaptureRawData	Sends the video frames (Raw Data) produced by custom video capture to the SDK (for the specified channel).
OnCustomVideoCaptureStart	Customize the notification of the start of video capture.
OnCustomVideoCaptureStop	Customize the notification of the end of the collection.
OnCapturedVideoFrameRawData	When custom video rendering is enabled, the original video frame data collected by the local preview is called back.
OnRemoteVideoFrameRawData	When custom video rendering is enabled, the remote end pulls the original video frame data to call back, and distinguishes different streams by streamID.
EnableCustomVideoProcessing	Enables or disables custom video processing, and support specifying the publish channel.

customAudioIO

Method	Description
StartAudioDataObserver	Enable audio data observering.
StopAudioDataObserver	Disable audio data observering.
EnableCustomAudioIO	Enables the custom audio I/O function (for the specified channel), support PCM, AAC format data.
SendCustomAudioCaptureAACData	Sends AAC audio data produced by custom audio capture to the SDK (for the specified channel).
SendCustomAudioCapturePCMData	Sends PCM audio data produced by custom audio capture to the SDK (for the specified channel).
FetchCustomAudioRenderPCMData	Fetches PCM audio data of the remote stream from the SDK for custom audio rendering.
OnCapturedAudioData	The callback for obtaining the audio data captured by the local microphone.
OnPlaybackAudioData	The callback for obtaining the audio data of all the streams playback by SDK.
OnMixedAudioData	Callback to get the audio data played by the SDK and the audio data captured by the local microphone. The audio data is the data mixed by the SDK.
OnPlayerAudioData	The callback for obtaining the audio data of each stream.

CopyrightedMusic

Method	Description
CreateCopyrightedMusic	Creates a copyrighted music instance.
DestroyCopyrightedMusic	Destroys a copyrighted music instance.
InitCopyrightedMusic	Initialize the copyrighted music module.
GetCacheSize	Get cache size.
ClearCache	Clear cache.
SendExtendedRequest	Send extended feature request.
GetLrcLyric	Get lyrics in lrc format.
GetKrcLyricByToken	Get lyrics in krc format.
Download	Download music resource.
GetDuration	Get the playing time of a song or accompaniment file.
OnDownloadProgressUpdate	Callback for download song or accompaniment progress rate.

deprecated_api

Method	Description
EnableBeautify	[Deprecated] Enables or disables the beauty features for the specified publish channel. Deprecated since 2.16.0, please use the [enableEffectsBeauty] function instead.
SetBeautifyOption	[Deprecated] Set beautify option. Deprecated since 2.16.0, please use the [setEffectsBeautyParam] function instead.
CreateEngine	[Deprecated] Create ZegoExpressEngine singleton object and initialize SDK. Deprecated since 2.14.0, please use the method with the same name without [isTestEnv] parameter instead. Please refer to Testing environment deprecation for more details.
RequestSong	[Deprecated] Request a song. Deprecated since 3.0.2, please use the [requestResource] function instead.
RequestAccompaniment	[Deprecated] Request accompaniment. Deprecated since 3.0.2, please use the [requestResource] function instead.
GetMusicByToken	[Deprecated] Get a song or accompaniment. Deprecated since 3.0.2, please use the [getSharedResource] function instead.
GetLrcLyric	[Deprecated] Get lyrics in lrc format. Deprecated since 3.2.1, please use the method with the same name with [vendorID] parameter instead.